#include <iostream>
using namespace std;

void input_array ( int *, int );
void display_array( int *, int );
void copy_array( int *, int *, int);
void standard_deviation( int *, int);

int main(){
	int *a, *a1;
	int n, n1;
	cout << "So phan tu:";
	cin >> n;
	a = new int [n];
	input_array ( a, n);
	cout << endl;
	display_array (a, n);
	cout << endl;
	cout << "Copy n phan tu dau tien. n = ";
	cin >> n1;
	a1 = new int [n1];
	copy_array ( a, a1, n1);
